Can a small, innocent lie be out of control and lead to a total disaster? Or maybe just as everything falls apart in life, it becomes possible to sort everything out again? Karina is trying to create the first (this time) happy relationship with all her might. Unfortunately, the man to whom she gave her heart seems to be more interested in herself than in her. One day, one unforeseen event and one small lie will turn her organized life into a real emotional rollercoaster. It will also quickly turn out that each of the characters has something to hide. When the truth comes out, everyone will have to finally clean up their relationships and in their hearts. "The fiancée of a fiancé" will love those who have once fallen in love with the wrong person and those who believe that it is worth fighting for true love, even if it starts badly.